Calculator



J. E. LYSEN.

CALCULATOR.

APPLICATION FILED APR. so. 1921.

Patented June 6, 1922.

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LICATION FILE D APR.30,1921

Patented June 6, 1922.

2 SHEETS-SHEET 2.

UNI'IED STATES JOHN E. LYSEN, OF CHICGO, ILLINOIS, ASSIGNOB. TO J'. W. BUTLER PAPER COMPANY.

PATENT orrlce.

A CORPORATION or ILLINOIS.

CALCULATOR.

To all whom z'tmaji/ concern.'

Be itV known that I, JOHN E. LYsEN, a citizen of the United States, residing at Chicago, in the county of Cook and State of illinois, have invented anew and useful Calculator, of which the following is a specii cation.

- tively few opera-tions necessary to solve any problem or series of problems, and because of the simplicity of operation, reduces the possibility of error. A further object is to provide a device whereby ordinary problems constantly arising in the paper industry, may be solved more rapidly than is possible by the use of devices now in general use, although the use of the invention is not limited to this particular industry.

The invention will be hereinafter fully set fort-h and particularly pointed out in the claims. l

,In the accompanying drawing Figure 1 is a top plan view illustrating a poltion of a calculator constructed to conform with the invention. Figure 1a is a similarI view illustrating the rest of the device. Figure 2 is a transverse sectional view thereof..

Referring to the drawing, 10 designates a base disk, 11 a second disk resting thereon, and 12 an indicator. The disks and indicator are' pivotally connected by suitable means, such as by the eyelet 13, whereby the parts referred to are free for relative rotation.

The disk 10 is provided with a concentrically arranged keyscale 14, numbered from 10 to one-hundred, the'numbers increasing in value in an anti-clockwise direction. Concentrically arranged with respect to the key scale 14 is a series of logarithmic scales 15, 16, 17, 18, 19, 20 and 21, all of which are provided with numbers running from ten to one-hundred in a clockwise direction, the numbers of each scale being staggered with Specification of Letters Patent.

Application filed April 31.), 1921. Serial No.'465,812.

respect to the numbers of the other scales,`

andwith respect to the key scale. 1

The second disk 11 is provided at its periphery with a key scale 22, havin numbers running from ten to olie-hundred 1n aclockw1se direction, said scale being correlated with the key scale 14 and with all of the logarithmic scales of the disk 10. The scale llnes of the scale 22 are extended inwardly from.l the edge of the disk 11, toward the center of the disk, but in a more or less tangential relationl to said center, as indicated at 23.

The indicator 12 is provided with indicia \26 which coincides with the key scales 22 and 14 respectively, and is also provided with indicia 27 positioned to coincide with thev respective,V logarithmic scales. The 'indicator arm is also provided with a scale 28 along one edge, the graduations of which cooperate with the inwardly extending!` tangentiallines 23.

The device illustrated ad described is iesigned particularly fo-r use in the paper industry, as an aid 1n ascertainingthe weight of various grades and sizes of papers.v Itv will be noted that the indicia. 27 specifies different standard dimensions of paper. It is to be understood however, that the invention is not limited in this particular, but

is capable of modification for use in any other industry. n v

In practice the various problems are so-lved by relative adjustments of the twov disks and of the indicator. For instance, assume the following problems zp Find the weight of a ream of 19 X 28 paper in a 17 X 22-18 lla-16 lha-18. lb.-20 lb.- 24 lb.-28 lb. and 32 lb. basis.

To solve the problem the numbers 19 and 28 in the key scales 22 and 14 respectively, are placed in register with each other. ,The

.disks are then held firmly, and the indica.

tor is set at the number 13 on the logarithmic scale which corresponds with the 17 X 22 size index on the indicator. This will cause the number 5 of the scale 28 to intersect thel line 23 leading' in from the number 18 of the key scale of disk 11. The total weight is then estimated by putting down the num'- ber 18 as the first two digits of the result to be ascertained, and by adding thereto as the third digit, the number 5 indicated on scale 28, thus indicating that the weight of a ream of 19 X 28 paper on a 17 X 22--13 lb.

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basis 'is eighteen and onefhal'l.E pounds. By successively moving the indicator from 13 to (1637, 1837, 20777 624:77 662877, (329, on the scale 16, 'the seventeen by twenty-'two circle, the respective results demanded by the problem, may be read on the disk 11, without necessitating the alignment of 19 to 32 each time, in scales 14 and 22, as is necessary in devices of this type now in general use.

By way of further illustration, let it be assumed that a realn of 32 X lf/l paper weighs 74 lbs., What is the weight of a ream of the same paper in a 25 x 38 size? Solution z--Align 32 and 44 on the key scales 22 and 14 of the second disk and the base disk respectively. The in'dicator is then set at 74; on the key scale 22 of the second disk. Then reading the logarithmic scale on the 25 X 38 circle scale 15 We nd that the answer is lbs.

The advantages of the invention will be readily understood by those skilled in the art to which it appertains. lt will readily be seen that various calculations may be quickly made by a very simple operation, thereby saving time and reducing the possibility of error.

Having thus explained lthe nature of the `invention and describedan operative manner of constructing and using the same, although without attempting to set forth all of the forms in which it may be made, or all of the Jforms of its use, what is claimed is 1. A calculator of the character described comprising a base disk provided with a key scale and a plurality of logarithmic scales all concentrically arranged with respect to each other, a second disk rotatably mount-- ed with respect to the base disk and provided vvith a key scale correlated with the scales on the base disk and arranged in concentric relation therewith, and an indicator arm movable in a circular path over both of said disks and' having indicia registering gli correlated with all or the scales or both relaas? ing a key scale at its periphery concentric' with and correlated with the scales on said base disk, the key scale of the smaller disk lying contiguous to the key scale of the base disk and an indicator pivotally connected with said disk at the centers thereof, and having an arm extending over said scales, said arm having indicia registering and correlated with all of the various scales of both disks.

3. A calculator of the character described comprising a base disk provided with a .key scale and a plurality of logarithmic scales -concentrically arranged with respect to the key scale and to each other, a second rela'f tively movable disk provided with a key scale concentric and correlated with the scales ofthe base disk, and an indicator arm movable over both disks in a circular ath, said arm having indicia registering with all of the respective logarithmic scales`r and a second set of indicia registering and correlated with the key scale ot the second disk.

4. A calculator of the character described comprising a base disk provided with a key scale and a plurality of logarithmic scales, a second disk rotatable with respect to the base disk and provided with a key scale correlated with all oit the scale of the base disk, said second disk having inwardly extending lines coinciding with its key scale, and a movable indicator arm having indicia coinciding with the respective scales on both disks, and also having a scale correlated with the inwardly eetending lines-of the second disk.

n testimony whereof I have hereunto set my hand.

JOHN E. LYSEN.

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